Fig. 5. Representative sky-cover occurrence frequency histograms. e.g., /> 0.8 for T > 0.80, is highly correlated with power availability such that P > 0.9. Hence, if we plot curves of P (1 of TV) versus TV for several different centroid radii, r, using this correlation, we can roughly estimate the receptor criteria for multiple sites. Using data for three sites in North Dakota taken for the month and hours when the cflos probabilities are the lowest, we have attempted to parameterize the dependence of P on TV and r. Figure 6 gives Lund's data, connected by solid lines, and our crude estimates of P for larger and smaller average site separations, shown by dotted lines. The centroid radius is the average distance for all sites to a central point, which may or may not be the electrical load center, and is defined by
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